Portsmouth police are investigating an armed robbery they said happened around 7:20 p.m. Saturday.

Police said they responded to a report of an armed robbery at the Mobil On-The-Run convenience store at 201 Islington St.

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According to police, the clerk reported a man entered the store, and while the clerk was waiting on him, the man showed what appeared to be a semi-automatic handgun and demanded cash out of the register.

The clerk gave the man money and was ordered to the ground while the robber left the store, according to police. There were no injuries.

The robbery remains under investigation.

Anyone with information is asked to call the Portsmouth Police Department's Bureau of Investigative Services at 436-2511, or remain anonymous by contacting Crime Stoppers at 603-431-1199 or 1-207-439-1199.

People can also contact police via their website at www.seacoastcrimestoppers.org.